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Jerky Horizontal Movement in Firefox

I have some JS code that works beautifully for a horizontal scrolling effect in IE, Safari, and Chrome, but in Firefox it seems the CSS "overflow: hidden;" is not clipping the content quickly enough. Does anyone have any suggestions on how to get this to function correctly? Visit here in Firefox and click any of the names on the left-hand column to see what I'm talking about:

I tried setting "display: none;", changing "left" value, and then setting it back to "display: block;" to see if it would avoid the clipping bleed, but it didn't make any difference. I'm running out of ideas. It bleeds unto the page background image as well, so I'm not sure z-index will make a difference, but I may go ahead and try that.